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System architecture
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Firmware
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These are fundamental programs consisting of hard-wired logic instructions
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stored in Programmable Read Only Memory (PROM) which manipulate
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data in the central processor and control input/output operations, error
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diagnostic and recovery routines.
Software
Software programs consist of instruction sequences that control call
processing, peripheral equipment, administration and maintenance
functions. These sequences are interpreted by the fiiware programs into
machine instructions. Several generic software programs with optional
feature packages are available to satisfy varying requirements.
Office Data
The office data describes the characteristics of the system in terms of
configuration and call dependent information such as features and services.
Office data is arranged into blocks defining peripheral equipment, system
configuration and transient data. These data blocks permit configuration of
Meridian 1 systems to specific customer needs.
Resident Programs
Resident Programs are programs always available in memory during system
operation. Firmware programs control other resident programs and provide
all CPU arithmetic operations. The other resident programs are those which
are automatically loaded into the system memory from the disk drive at
system power-up. Once loaded, these programs remain in memory.
Non-Resident Programs
Non-Resident Programs are the overlay programs stored on disk which are
loaded into the “overlay area” of system memory when required to perform
specific tasks. Only one overlay program may be loaded at a time and is
removed from the overlay area when no longer required. Overlay programs
can be loaded automatically, under program control, or manually, via an
administrative terminal.
Once the user has logged into the system, commands for specific overlay
programs are processed by the overlay loader program. When loaded, the
overlay program assumes control. Only one administrative terminal can
input into the overlay arca at a time. More than one device, however, can
System overview 553-3001-l 00